The occurrence of sparks will greatly affect the smoothness and processing quality of the cut section of the part. At this time, when other parameters are correct, the following conditions should be considered: 1. The nozzle of the laser head is worn, and the nozzle should be replaced in time. 2. In the case that no new nozzle needs to be replaced, the working gas pressure of the cutting auxiliary cutting should be increased. 3. The thread at the connection between the nozzle and the laser head is loose. At this time, the cutting process should be suspended immediately, the connection status of the laser head should be checked, and the thread should be re-installed.